F/A-18A Inlet Flow Characteristics During Maneuvers with Rapidly Changing Angle of Attack
Yuhas, Andrew J. and Steenken, William G. and Williams, John G. and Walsh, Kevin R. (1997) F/A-18A Inlet Flow Characteristics During Maneuvers with Rapidly Changing Angle of Attack. Technical Report NASA TM-104327, Research Engineering, NASA Dryden Flight Research Center.
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Abstract
The performance and distortion levels of the right inlet of the F/A-18A High Alpha Research Vehicle were assessed during maneuvers with rapidly changing angle-of-attack at the NASA Dryden Flight Research Center, Edwards, California. The distortion levels were compared with those produced by current inlet-engine compatibility evaluation techniques. The objective of these analyses was to determine whether the results obtained for steady aerodynamic conditions were adequate to describe the inlet-generated distortion levels that occur during rapid aircraft maneuvers. The test data were obtained during 46 dynamic maneuvers at Mach numbers of 0.3 and 0.4. Levels of inlet recovery, peak dynamic circumferential distortion, and peak dynamic radial distortion of dynamic maneuvers for a General Electric F404-GE-400 turbofan engine were compared with estimations based on steady aerodynamic conditions. The comparisons were performed at equivalent angle-of-attack, angle-of-sideslip, and Mach number. Results showed no evidence of peak inlet distortion levels being elevated by dynamic maneuver conditions at high angle-of-attack compared with steady aerodynamic estimations. During sweeps into high angle-of-attack, the peak distortion levels of the dynamic maneuvers rarely rose to steady aerodynamic estimations. The dynamic maneuvers were shown to be effective at identifying conditions when discrete changes in inlet behavior occur.
| EPrint Type: | NASA Technical Memorandum |
|---|---|
| Keywords: | Comparison to steady aerodynamic conditions, F/A-18A aircraft, High angle of attack, Inlet distortion, Rapid angle-of-attack maneuvers |
| Subjects: | Aircraft/Project: F-18 HARV (01 - 09) Aeronautics: (07) Aircraft Propulsion And Power |
| ID Code: | 131 |
| Deposited On: | 07 June 2004 |
| Additional Information: | 21 pages. Oral presentation presented at the NASA High Angle-of-Attack Technology Conference, Inlet Aerodynamics and Propulsion Session, NASA Langley Research Center, September 17–19, 1996, Hampton, Virginia. NASA Contract NAS 3-26617 |
